I think the best altcoins best to buy Cardano and Tron because the future of Cardano and Tron are promising and bright.also these coins prices are very low.so now is the best time to buy.I hope these coins are will give you huge profit in the future.
Both look overvalued for me personally, i prefer to invest in a new altcoin that will bring us new technology and innovation that will give us a lot of advantages. Veil is my best candidate right now consider privacy is something that really needed by everyone. I never have seen any usefulness from tron and it's still lack of utility usage.
Even if veil is a privacy coin that working on the different field than tron but the fact said veil has more advantages even surpass the major coin.